Tailor&#39;s chalk sharpener with replaceable blade



Patented Mar. 28, 1939 PATENT OFFICE TAILORS CHALK SHARPENE-R WITH RE-PLACEABLE. BLADE Vincent Rago, Chicago, Ill.

Application September 29, 1937, Serial No. 166,349

3 Claims.

This invention relates to an improved tailors chalk sharpener withreplaceable blade, and the present invention constitutes an improvementH over my previous Patent No. 2,022,299 on Tailors chalk sharpener datedNovember 26, 1935, and also my patent on Tailors chalk sharpener, 0.dated September 28, 1937.

One of the principal objects of this invention is to provide an improvedchalk sharpener of this type wherein the shavings scraped off by thesharpening blade will drop automatically into the bottom of the attachedcontainer which also constitutes a blade support.

Another object of the invention is the provision of a raised rim aroundthe back and sides of the sharpener to insure against any of theshavings getting out or falling on the clothing being marked.

A still further object is the provision of means whereby the sharpeningblade comprises and can be replaced by practically any standard make ofrazor blade.

Another important object of the invention is the provision of adjustingmeans for the blade holder whereby the chalk sharpening effect can bevaried as desired.

Another and still further important object of the invention is toprovide a tailors chalk sharpener which is simple yet effective inoperation,

and a device that can be positioned in any con venient place.

Other and further important objects of the invention will be apparentfrom the disclosures in the accompanying drawing and following specification.

The invention, in a preferred form, is shown in the drawing andhereinafter more fully described.

In the drawing:

Figure 1 is a perspective view of the improved tailors chalk sharpenerof this invention.

Figure 2 is a detail bottom View of the blade holder and adjacentframework.

Figure 3 is a front detail view of the assembled blade holder and blade.

Figure 4 is a side view of the structure of Figure 3.

Figure 5 shows the blade holder with one part removed and with the bladepositioned on a pair of supporting pins.

Figure 6 is a side view of the structure of Figure 5 and showing thesame positioned in its framework and also illustrating details of theblade adjusting elements.

Figure 7 is a sectional view showing one end support for the frameworkof Figures 2 and 6, and illustrating adjacent portions of the casing.

As shown in the drawing:

The reference numeral I0 indicates generally the casing of the sharpenerwhich acts as a con- 5 tainer for shavings and which is also the supportfor the blade holder framework. The casingis preferably made of sheetmetal, but can be made of any suitable material such as a syntheticresin, wood or cardboard cut to shape and then folded 10 into thebox-like form illustrated.

The ends of the box are provided with inner abutments I2 which areeither integral, welded or glued in position depending on the materialof the casing. On these abutments l2 rests the 15 bridge-like structureor open framework it which,

in turn, has the blade holder composed of two parts l6 and I8 adjustablypositioned in it. Between these two parts It and ill of the bladeholder, the blade 29 is held firmly. The effective 20 height of theblade holder can be adjusted by means of the screws 22 which arethreaded into part l6 of the holder and work in the slots 26. The bladeholder part I6 is maintained in proper upright position in the frameworkby means of 5 two sets of parallel ridges 24 preferably formed integralwith the framework and on opposed inside faces thereof, as best shown inFigure 2.

Opposed grooves 2'! are provided in the holder parts I6 and l 8 for amore positive gripping of the 30 blade 20'.

The bridge or framework may be of metal, wood or composition orcombinations thereof and may be of one or more parts.

A new blade can be inserted in the holder when- 5 ever desired byremoving the screw 28 which allows the plate It to be taken off. Theblade fits over the projecting pins 39, and the plate I8 is thenreplaced in proper position, and the screw 26 is reset. The pins andscrew holes are arranged 40 to fit ordinary razor blades. The bridge 14is held firmly to the abutments I2 by screws 32. Positioned on thebridge adjacent both sides of the blade 20 are platforms 34 of suitablematerial to which the chalk will not adhere. 45

The dull chalk is held by its ends in one hand, and at the desired angleis moved back and forth over the edge of the blade, which projectsslightly above the level of the platforms 34, approximately onesixty-fourth of an inch. The platforms also 50 serve as a level forproperly aligning and tapering the effective sharpened edge of thechalk.

The platforms do not extend to the ends of the framework and neither dothey extend up to the blade, thereby leaving openings for the shavings55 to fall through. The raised rim 36 around the sides and back of thecasing l0 prevents the shavings from flying outside the box, and thecutaway portion in the front allows sufficient space for the hands ofthe operator.

It will be evident that herein is provided a tailors chalk sharpenerwhich constitutes a distinct improvement over prior devices in that abetter support and more capacious and efiicient receptacle are provided,and additionally, a deflnite adjustment for the cutting or sharpeningblade is readily available to the operator. Furthermore, the device canbe economically constructed, is not cumbersome, and efiectively preventsspillage and consequent disorder.

I am aware that many changes may be made and numerous details ofconstruction varied throughout a wide range without departing from theprinciples of this invention, and I, therefore, do not purpose limitingthe patent granted hereon otherwise than as necessitated by the priorart and appended claims.

I claim as my invention:

1. A chalk sharpener, including an open-top casing, a framework thereinbridged from one end of the casing to the other, a sharpening bladepositioned in the center of said framework, operating platforms adjacentthe blade, said platforms being foreshortened to leave openings in andaround the blade and framework for automatically dropping scrapings tothe bottom of the casing.

2. A chalk sharpener, including an open-top casing, a framework thereinbridged from one end of the casing to the other, a sharpening bladepositioned in the center of said framework, operating platforms adjacentthe blade, said platforms being foreshortened to leave openings in andaround the blade and framework for automatically dropping scrapings tothe bottom of the casing, and means for adjusting the efiective heightof the blade with regard to the platforms and framework, said meanscomprising a support for the blade, parallel ridges in the framework forreceiving the blade support and adjusting screws and slots in thesupport and framework, respectively.

3. A chalk sharpener, including an open-top casing, a framework thereinbridged from one end of the casing to the other, a sharpening blade ofstandard razor blade type positioned in the center of said framework,operating platforms adjacent the blade, said platforms beingforeshortened to leave openings in and around the blade and frameworkfor automatically dropping scrapings to the bottom of the casing, andmeans for adjusting the effective height of the blade with regard to theplatforms and framework, said means comprising a'support for the blade,parallel ridges in the framework for receiving the blade support andadjusting screws and slots in the support and framework, respectively,and means for positioning said standard razor blade in said support.

VINCENT RAGO.

